<!DOCTYPE html> <html> <meta charset="UTF-8"> <title>CSS Containment Test: absolute positioned 'contain: size' element is monolithic</title> <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com"> <link rel="author" title="Mozilla" href="https://www.mozilla.org/"> <link rel="help" href="https://drafts.csswg.org/css-contain-1/#containment-size"> <link rel="match" href="../reference/ref-filled-green-100px-square-only.html"> <meta name="assert" content="This test checks that an absolute positioned element with size containment is monolithic."> <style> #multicol { width: 300px; column-count: 3; } #container { position: relative; } #abs-size-contain { position: absolute; contain: size; width: 100px; height: 100px; background: green; } </style> <p>Test passes if there is a filled green square.</p> <div id="multicol"> <div id="container"> <div id="abs-size-contain"></div> </div> </div> </html>